HB3YAQLucerne
Ground plane
A simple ground-plane antenna consists of a vertical radiator and a conductive counterpoise, often radials. In the quarter-wave model, the radiator is approximately a quarter wavelength long.
Also found under: Groundplane · Ground Plane · Radial · Radials · Viertelwellenstrahler
A concrete example
In the calculator, radiator and radial lengths change with the entered frequency.
What to keep in mind
Radial angle and surroundings affect the feed impedance; the drawing does not replace tuning.
Further reference
Original explanation based on the technical documentation. Reviewed on 15 October 2026.
ITU-R SM.2055 · Radio noise measurements, §6.13.3 ↗